I published the following diary on isc.sans.edu: “Running your Own Passive DNS Service“: Passive DNS is not new but remains a very interesting component to have in your hunting arsenal. As defined by CIRCL, a passive DNS is “a database storing historical DNS records from various resources. The historical data
Passive DNS is not a new technique but, for the last months, there was more and more noise around it. Passive DNS is a technique used to record all resolution requests performed by DNS resolvers (bigger they are, bigger they will collect) and then allow to search for historical data.
I published the following diary on isc.sans.org: “Investigating Security Incidents with Passive DNS“. Sometimes when you need to investigate a security incident or to check for suspicious activity, you become frustrated because the online resource that you’re trying to reach has already been cleaned. We cannot blame system administrators and